Jaw crusher with double toggle



Nov, E3, l95

R. R. SHAFTER 2,575,301

JAW CRUSHER WITH DOUBLE TOGGLE Filed Oct. 5, 1946 5 Sheets-Sheet l NOV. 13, 1951 R. R.y sHAFTx-:R

JAW CRUSHER WITH DOUBLE TOGGLE 5 Sheet's-Sheet 2 Filed Oct. 5, 1946 m n IW////////// m J/V VV Nm. km. m umd uw. NN .JI

Nov. 13, 1951 Filed OCC. 5, 1946 y R. R. SHAFTER JAW CRUSHER WITH DOUBLE TOGGLE 3 Sheets-Sheet (5 @www Patented Nov. 13, 1951 JAW CRUSHER WITH DOUBLE TOGGLE Ruland R. Shaftcr, Freeport, N. Y., assignor to Nordberg Manufacturing Company, Milwaukee, Wis., a corporation of Wisconsin Application october 5, 1946, serial No. '101,511

6 Claims. 1

My invention relates to an improvement in jaw crushers and has for one purpose to provide improved releasing means for permitting one jaw Ato recede from the other when uncrushable mate- `rial passes between the jaws.

Another purpose is to provide a breakable support which, when ruptured, will permit one of the jaws to recede from the other.

Another purpose is to provide an improved rupturable roller and means for maintaining it in predetermined alignment.

`Another purpose is to provide dust-shielding means for the rupturable element.

Other purposes will appear from time to time in the course of the specication and claims.

The present application is a continuation, in part', of my application Serial No. 630,172, led in the United States Patent O'fhce on November 23, 1945, and abandoned on October '2, 1947, for Jaw Crusher.

.y The invention is illustrated more or less diagrammatically in the accompanying drawings wherein: l

Figure 1 is a vertical section taken at right angles to the axis of the actuating shaft of the crusher;

Figure 2 is a section on the line 2--2 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 2;

Figure 4 is a section on the line 4-4 of Figure 2 on an enlarged scale;

Figure 5 is a detail; and

AFigure 6 is a partial section, similar to Figure 3, of a modified form.

Referring to the drawings, I illustrate a jaw crusher, including side frame plates I, a fixed end plate 2 and a rear end portion 3, unitary with, or secured to, the side plates. The details of the design and assembly of the jaw crusher frame, thus formed, do not of themselves form part of the present invention. Parts may be assembled in any desired manner and may be held together by longitudinally extending bolts. Side portions '5 may be provided, in which is mounted the jaw shaft 6. Oscillating with or about the shaft B, depending upon the design of the crusher, is the crusher jaw, generally indicated as 1. It is shown as having a front plate portion 8 bounded by an upper ledge 9 and a lower ledge I0. The upper portion II is somewhat inclined in relation to the lower portiony I2, as is clear from Figure 1. Abutting against the portions II and I2 are the jaw sections I3 and I4 which may be held in position against each other and against the lower ledge I by any suitable means, such as by the wedge I5, having an inclined surface I6. opposed to a correspondingly 2 formed upper surface on the plate section I3. The bolts I'I may be employed to move the wedge I into the locking position in which it is shown in Figure 1, the bolt I1 having nuts I8 opposed to the rear face of the rear web portion I9 of the jaw. The plates I3 and vI4 may be rearwardly formed or channeled, as at 20, to receive any suitable layer of soft metal which is normally poured between the rear faces of the plates and 10 the forward faces I I and I2 of the jaw. 1

Corresponding opposed jaw plates 2I and 22 may be secured to the end portion 2 of the jaw crusher frame. It will be noted that they are slightly inclined in relation to each other, as l shown in Figure l.

edge of the bottom plate 22, and any suitable clamping member 24 may be employed for urging the upper plate 2| downwardly against the upper edge of the lower plate 22. Any suitable side plates 25, 2G may be employed, mounted in any 25 suitable manner on or in relation to the side frame portions I to close the ends of the crushing activity dened between the opposed jaw surfaces.

The movable jaw 'I is moved about its axis X toward and away from the i'lxed jaw in the following manner:

A crusher shaft 3!) with its eccentric intermediate portion 3I is rotatably mounted in the jaw frame and is provided with' any suitable iiy wheel 32 or any suitable driving connection not herein shown. Rotatably surrounding the ece centric portion 3I of the shaft 30 is a pitman including the upper hub portion 33a and the lower hub portion 33, the two being secured to-` gether for assembly by bolts 34 with their appropriate'nuts 35. Extending downwardly from the hub portion 33 is the actuating arm 36 with its lower actuating portion or enlargement 31. In a forward recess 38 of the enlargement 31a roller engaging block 39 is positioned, having an upwardly and rearwardly inclined face 40 adapted to receive and engage the compression transmitting roller 4l. The roller bears against the oppositely inclined block 42 in any suitable recess 43 in a lower part of the rear web of the the bottom enlargement 31 of the actuating arm 36.

5 Y Opposed inclined surfaced bearing blocks 52 with the nuts 56, downwardly headed as at 51 It will be noted that the two rollers are, in

eiect, hollow, rupturable cylinders. At each end of each cylinder is a hollow, outwardlyextending portion carrying gear teeth 61 which mesh with suitable racks 68 at the ends of the inclined blocks. Any suitable protecting dust aprons 1U, of flexible material, and secured at their opposite edges, overlie and protect the rupturable roller structures. As will be clear from Figure 1, I have illustrated the rollers or cylinders of diiferent thicknesses. If desired, both of them may be thick enough to rupture readily, at a predetermined excess crushing stress; both rollers may be of the same degree of weakness or rupturability. It may be advantageous to employ hollow rollers, with one somewhat thinner than the other. Thus under normal circumstances, even when an excess crushing stress exists, only one of the rollers will be ruptured.

' It will be understood that as the eccentric 3| actuating arm 36. It passes through the flange' 82 of the rear end portion 3 of the frame and is provided with a coil spring 83 compressed between the ange 82 and the adjustable abutment 85. 4The tension rod 85 is pivoted as at 86 to the lower end of the movable jaw l. It will be understood that it also may extend through the flange '82 and be provided with a spring and abutment structure similar to that shown for the rod 8D. Itwill be understood that as many rods as necessary, may be employed for 'the movable jaw and for the actuating arm. For example, they may be arranged in pairs. Any suitable shim structure 60 may be employed, with a lock member E I, in order to control the position of the iixed block 53. It will be clear that the vertical oscillation of the member 36, in response to the rotation of the shaft 30 and the eccentric 3|, will oscillate the movable jaw 1, with its face plates i3 and I4, toward and away from the xed jaw structure 2, and its faceplates 2| and 22.

Whereas in Figure 1 I `illustrate the rollers as 4 having gear teeth at their major diameter, I may nd it advantageous to employ, as shown in Figure 6, a roller having a hollow reduced end, with gear teeth on the hollow end, as shown at 66a and 31a of Figure 6.

It will be realized that whereas I have described and. shown a practical and' operative device.

nevertheless many changes in size, shape, number and disposition of parts may be made without departing from the spirit and content of my invention. vI therefore wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my specific showing herein.

The use and operation of the invention are as follows:

AI provide an arrangement of jaw plates in which the front jaw plates 2i and 22 form a convex jaw and the rear or swinging jaw plates form a concavejaw.A The two jaws have an acute angle of nip at the lower part of the crushing cavity.

A novel feature of my device is the employment of, in effect, a double inclined pitman connection between the xed abutment 53 and the movable jaw l, which, in response to rotation `oi? the eccentric 3l, oscillates the jaw 1 toward and away `from the xed jaw structure 2. As will be clear from Figure 1, I provide, on the lower enlargement ofthe member 33, oppositely inclined roller blocks 39 and 52, the two blocks having front faces upwardly and inwardly inclined toward each other. Each roller bears, at its opposite side, against a block 42 or 53, having a face generally parallel with the face of the block 39 or 52. One or both of the :cylinders or rollers may be made rupturable. And preferably, they are of different thickness so that it is possible for one roller or cylinder to rupture, without the rupture of the other. Employing a rupturable roller or rollers provides not only an enicient mechanism for oscillating the movable jaw 1, but also provides ja quickly operative and enicent release elective in the event that the movable jaw encounters uncrushable material. Thus breakage of any part of the vstructure is prevented, except the rupture of the roller or rollers.

I find it advantageous to provide gear teeth at each end of each roller, meshing with opposite racks to maintain the rollers constantly in the horizontal position. Thus as the member 36 moves upwardly or downwardly in response to rotation ofthe eccentric 3l, the position of both rollers 4l is always controlled 'and their axes are maintained parallel with the horizontal and with the axis of rotation of the shaft 30.

I claim.

1. In a jaw crusher, a frame, a jaw normally fixed on said frame, a swinging jaw, movable in relation to said xed jaw, means for oscillating said swinging jaw toward and away from said fixed jap/, including an eccentric rotatably mounted on said frame and means for rotellina,r it, an actuating member mounted for generally upright oscillation in response to said eccentric, a" fixed abutment on said frame, said actuating member including a portion extending between said nxed abutment and said swinging jaw, a

' camming connection between said actuating clined to the radius of said swinging jaw. the faces of each pair of bearings converging upwardly toward the faces of the opposite pair.

2. l'n a jaw Crusher, a frame, a jaw normally xed on said frame, a swinging jaw, movable in relation to said iiXed jaw, means for oscillating said swinging jaw toward and away from said fixed jaw, including an eccentric rotatably mounted on said irarne and means for rotating it, an actuating member mounted for generally upright oscillation in response to said eccentric, a iixed abutment on said frame, said actuating member including a portion extending` between said xed abutment and said swinging jaw, a camming connection between said actuating member and said iixed abutment, and an opposite camming connection between said actuating member and said movable jaw, each said camming connection including roller and diametrically opposed plane bearings therefor, the faces of each pair of bearings being parallel, but inclined to the radius of said swinging jaw, the faces of each pair of bearings converging upwardly toward the faces of the opposite pair, and yielding means tending normally to urge said swinging jaw away from said iixed jaw, and for thereby maintaining said camming connections opposed. f

3. In a jaw Crusher, a frame, a xed jaw on said frame, a swinging jaw, movable in relation to said frame, means for moving said swinging jaw toward and away from said xed jaw, including an eccentric rotatably mounted on said frame, an actuating member mounted for generally vertical oscillation, and a driving connection for said swinging jaw including a plurality of rupturable members, normally under compression, and adapted to rupture at predetermined but diierent crushing stresses, said rupturable members being hollow cylinders, one said cylinder being under compression between the actuating member and the frame, the other being under compression between the actuating member and the swinging jaw, said actuating member having cam faces, inclined to each other and to the radius of said swinging jaw, and opposed, respectively, to each said roller.

4. In a jaw crusher, a frame, a fixed jaw on said frame, a swinging jaw, movable in relation to said frame, means for moving said swinging jaw toward and away from said xed jaw, including an eccentric rotatably mounted on said frame, an actuating member mounted for generally upright oscillation in response to rotation of said eccentric, a flexible dust apron interposed between said actuating member and said swinging jaw and a camming actuating connection between said actuating member and said swinging jaw, including a hollow roller adaptedl to rupture when the swinging jaw encounters uncrushable material, said actuating member and said swinging jaw having substantially parallel opposed inclined surfaced bearings between and along which said hollow roller rolls under compression, said dust apron overlying said hollow roller and adapted to flex upon rupture of said roller.

5. The structure of claim 4 characterized by and including means for maintaining a spaced relation between said swinging jaw and said actuating member and between said actuating member and said frame including tension rods pivoted to said swinging jaw and yieldingly attached to said frame and other tension rods pivoted to said actuating member and yieldingly attached to said frame.

6. The structure of claim 4 characterized by the provision of a plurality of hollow rollers, one being between the actuating member and the swinging jaw and the other being between the actuating member and the frame, said hollow rollers having like outside diameters, one of said rollers having a greater inside diameter than the other, whereby one of said rollers is more readily rupturable than the other.

RULAND R. SHAFTER.

REFERENCES CITED The following references are of record in the file of this patent:

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